CAUSE
The router defaults to unnumbered WAN links with Routing and Remote Access
Service for Windows NT Server 4.0. If the Network number for the remote
router changes to anything other than all zeros the local router will drop
all RIP and SAP packets from the remote router.
For example:
From the local router, right-click Summary under IPX Routing. Then
select Update Routes. After doing this several times, the Network
number for the remote router may become something other than all zeros.
The local router will then drop any RIP & SAP packets received from the
remote router. Update Routes will no longer work.
To verify you are seeing this problem, do the following. Go to a command
prompt on each router and type:
You should see something similar to this depending on how many network
cards are installed, and so on.
NWLink IPX Routing and Source Routing Control Program v2.00
net 1: network number 00002602, frame type 802.2, device El59x1
(00c04fc29c12)
net 2: network number 00002602, frame type ethernet ii, device
NdisWan10 (f4aa8a000000)+ active wan line
If the NdisWan device's network number is something other than all zeros,
then you are experiencing this problem.
This is how it should look:
NWLink IPX Routing and Source Routing Control Program v2.00
net 1: network number 00002602, frame type 802.2, device El59x1
(00c04fc29c12)
net 2: network number 00000000, frame type ethernet ii, device
NdisWan10 (f4aa8a000000)+ active wan line
RESOLUTION
This problem will only happen if it is an unnumbered WAN Link. For additional information about how to work around this problem by disabling unmumbered WAN links, please see the following
article(s) in the Microsoft Knowledge Base:
197205 RRAS IPX VPNs Generate Event ID 20124